NE567N NXP Semiconductors, NE567N Datasheet - Page 11

• Manufacturer Part Number: NE567N
• Manufacturer: NXP Semiconductors

Specifications of NE567N

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Package Type: PDIP
• Pin Count: 8
• Mounting: Through Hole
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
CHATTER PREVENTION
Chatter occurs in the output stage when C
that the lock transient and the AC components at the quadrature
phase detector (lock detector) output cause the output stage to
move through its threshold more than once. Many loads, for
example lamps and relays, will not respond to the chatter. However,
logic may recognize the chatter as a series of outputs. By feeding
the output stage output back to its input (Pin 1) the chatter can be
eliminated. Three schemes for doing this are given in Figure 20. All
operate by feeding the first output step (either on or off) back to the
input, pushing the input past the threshold until the transient
conditions are over. It is only necessary to assure that the feedback
time constant is not so large as to prevent operation at the highest
anticipated speed. Although chatter can always be eliminated by
making C
the 567 by allowing C
time constant is made quite large, a short burst at the input
frequency can be stretched into a long output pulse. This may be
useful to drive, for example, stepping relays.
2002 Sep 25
Tone decoder/phase-locked loop
*OPTIONAL - PERMITS
LOWER VALUE OF C
C
3
567
3
1
large, the feedback circuit will enable faster operation of
8
10k
R
f
*
Figure 20. Chatter prevention
V+
3
C
R
f
f
to be kept small. Note that if the feedback
L
567
1
200 TO
1k
R
C
(Figure 20)
A
8
3
V+
10k
R
R
f
L
3
is relatively small, so
567
V+
1
200 TO 1k
R
A
8
10k
SL00557
R
f
V+
R
L
11
DETECTION BAND CENTERING (OR SKEW)
ADJUSTMENT
When it is desired to alter the location of the detection band
(corresponding to the loop capture range) within the lock range, the
circuits shown above can be used. By moving the detection band to
one edge of the range, for example, input signal variations will
expand the detection band in only one direction. This may prove
useful when a strong but undesirable signal is expected on one side
or the other of the center frequency. Since R
cycle slightly, this method may be used to obtain a precise duty
cycle when the 567 is used as an oscillator.
RAISES f
LOWERS f
567
567
(Figure 21)
2
1
O
Figure 21. Skew adjust
O
V+
R
C
R
C
50k
2
A
2
V+
1.0k
RAISES f
2.5k
R
R
B
C
NE567/SE567
567
SILICON
DIODES FOR
TEMPERATURE
COMPENSATION
(OPTIONAL)
RAISES f
LOWERS f
B
2
O
also alters the duty
SL00558
C
O
2
O
R
Product data